j9fd3s

REW engines usually die from a bad coolant seal, seems like they run a little too hot for a long time....



and the REW rotor housings already have a rudamentary version of this cooling mod

dead_eye

Would a spiral pattern like a thread not give better results?

The spinning force would keep turbulance in the water and also force it out against the walls of the water way so you get maximum contact.



I must admit this is a mod ive never heard of before but il definately be giving it a go on one of my engines soon and see if it makes any difference to running temps

ikari89

If the cuts were to go parallel to the water flow you would be encouraging laminar flow though the housing you want turbulent flow even though it is slower. This is because in laminar flow the water that stays closest to the housing with act as a insulator to the water farthest away from the housing as it heats up. Cutting parallel to the flow would increase cooling but only because of increased surface area but the perpendicular cuts will increase surface area as well as increase turbulent flow. But I don’t think any one will be seeing any major difference in water temps but instead a decrease in housing temperature by only a couple of degrees tops. in fact its even a possibility that one will see an increase in water temps as heat is being more evenly distributed between the motor and water.

Hyper4mance2k

A decrease in housing temps is the whole point. Lower housing temps= safer working coondition for the engine.

z-beater

I think that his main point was that he think that this mod is useless. I would like to hear how others feel about this. I really do not feel like digging out my thermodynamics book and calculating.



Also what are other REW owners doing to decreace temps?



Z

REZCAR

Well I think that increased surface area is definitely going to increase cooling. But the whole laminar vs turbulent argument is beyond me.



Here's a pic of a carbide ball.



I don't understand how you can make those cuts with this. Seems like it'd just make everything dull and

round. Maybe they're using a real small diameter? BTW, Mcmaster-carr sells these.

ikari89

Yeah the decrease in housing temp is the whole point I’m just saying that people only looking at the water temp will probably be disappointed in what they find.



And as far as how much of a difference it makes, it can’t hurt so if you have free time why not? But I think the rough surface on the inside of the housings pretty much get the job done, to a point, as far as turbulence goes.

ikari89

and depending on how deep those cuts are i bet the precentage the surface area increases will be pretty small, thus not all that much of a cooling increase.

Hyper4mance2k

Well if Racing Beat recomends it on all applications over 400 hp it must be worht it. They don't do anything that they feel isn't worth the gain.

ikari89

thats all opinion, but yeah i will probably do it to my next engine.

just need to find some free time in a ACed garage

any one know of one in tucson az